Posts Tagged ‘imt 2000’

3G Development

Written on November 7th, 2009 by MadChasno shouts

3G Development

3G used to be a lot less powerful in terms of coverage and efficiency a few years back. Some of the biggest nations of the world introduced and launched initial models, then continued to develop the details to further cater to the needs of consumers all over the world. There are approximately 3 billion mobile subscribers in the world, with 3G starting to take a big piece of the pie. Here are some more information about the growth.

Spreading More

Turkey auctioned 4 IMT 2000/UMTS standard 3G licenses with 25, 35, 40 and 45 MHz top frequencies in November 2009. With the 358-million euro offer by Turkcell, it has availed of the 45 MHz band, followed by Avea and Vodafone leasing the 35 and 40 MHz respectively for 2 decades. The only one available for auction at present is the license for the 25 MHz top frequency.

A 3G video call created from Johannesburg, South Africa via the Vodacom network in November 2004 was the very first use of 3G technology in Africa. EMTEL in Mauritius launched the first commercial 3G in Africa via the W-CDMA standard. In March 2006, a 3G service was given by the emerging company Wana in North African Morocco. 3G HSDPA services was implemented by Rogers Wireless in Eastern Canada as early as 2007 via Rogers Vision. Fido Solutions and Rogers Wireless currently provides 3G service in several urban centers.

Rates of Data

The ITU has not yet given a concrete description of the data rate that consumers can get from 3G providers or equipment and tools. The consumers who were given 3G service may not clearly point out a suitable standard, indicating that the rate given are met adequately. In a commentary, it was stated that the expectation for IMT-2000 will give higher rates of transmission, having a minimum speed of 2Mbit/s and the highest at 14.4 Mbit/s for stationary consumers. 348 kbit/s can be expected in a moving vehicle.

The ITU does not specifically indicates a minimum or average rates or the modes of the interfaces that can be considered as 3G technology, so different rates are offered and sold as 3G, which are expected to meet the expectations of consumers with broadband speed. Industry sources recommend that 3G can give 384 kbit/s at or lower than pedestrian speeds, with only 128 kbit/s inside a moving vehicle. Although EDGE is included in the 3G standard, a number of phones say that 3G network availability and EDGE have separate functionality.

Standardizing the Network

The ITU or International Telecommuncation Union described the demands for 3G mobile networks, using the IMT-2000 standard. The 3GPP or 3rd Generation Partnership Project is a group that continues to work by describing a mobile system that meets the standard of IMT-2000. The system is known as UMTS or Universal Mobile Telecommunications System.

There are 6 radio interfaces in IMT-2000 namely, W-CDMA or UMTS, CDMA2000, UWC which is implemented frequently with EDGE, TD-CDMA/TD-SCDMA, DECT and Mobile WiMAX.

On Advantages

UMTS is based on layered services, apart from GSM. The top of the line is the services layer, which gives quick deployment of services, plus a centralized place. At the center is the control layer, which supports the upgrade of processes and provides the capability of the network to be allocated in a dynamic manner.

At the bottom line is the connectivity layer, wherein any type of transmission technology can be applied, with the voice traffic transfering over IP/RTP and ATM/AAL2.

About the CDMA2000

Written on November 4th, 2009 by MadChasno shouts

About the CDMA2000

There are different platforms or types of 3G technology. Each manufacturer has created and developed some of the most innovative products and mobile handsets. The CDMA2000 is one of the 3 major types. It has different features and tools also that will surely give you a whole new experience, unlike other technologies before it. Here are the details on how to make the most out of the specification.

Introduction

The CDMA2000 specification was created and developed by the Third Generation Partnership Project 2 or 3GPP2, which is a partnership that consists of 5 telecommunication standard bodies: TTC and ARIB in Japan, TTA in Korea, TIA in North America and CWTS in China. CDMA2000 has been implemented to a lot of networks as an evolutionary step from CDMAOne. CDMA2000 gives a full backward compatibility with IS-95B.

CDMA2000 is not contained only into a single IMT-2000 and, although managers have the ability to overlay ACDMA2000 1x system. The system backs 144 Kbps at present, with data rates running up to 307 Kbps in the near future, over the other present CDMAOne network.

Evolving the Technology

CDMA2000 1xEV is the other name of the evolved CDMA2000. This technology will be implemented via a number of steps, namely the 1xEV-DV and 1xEV-DO. 1xEV-DO which represents 1x Evolution Data Only. 1xEV-DV represents 1x Evolution Data and Voice. The two 1xEV CDMA2000 evolution steps will use a carrier standard 1.25 Mhz. 1xEV-DO will most likely be available for the operators CDMA2000 during 2002. The solutions for 1xEV-DV were made available in 2004.

CDMA2000 3x and CDMA2000 1x EV-DO are approved by ITU and IMT-2000 3G basics. CDMA2000 3x is a portion of what the ITU has called IMT-2000 CDMA MC or Multi Carrier. This uses a lower than 5 MHz spectrum via 3x 1.25 MHz channels to provide speeds of more than 2 Mbps.

The Technical Summary

As for the summary of the CDMA2000, the frequency band can be any type or existing and. The minimum frequency band needed for 1x is 2 x 1.25 MHz. For 3x, the required is 2 x 3.75 Mhz. Chip rate for 1x is 1.2288. For 3x, chip rate is 3.6864 Mcps.

The maximum user data rate for 1x is 144 Kbps at present and 307 Kbps in the near future. As for 1xEV-DO, the max rate is 384 Kbps to 2.4 Mbps. The frame length is 5 ms, 10 ms or 20 ms. As for power control rate, it is at 800 Hz. The spreading factors are 4 256 UL.

On WCDMA

W-CDMA in 3G is known as wideband code division multiple access. It is one of the main technologies used for the implementation of 3G cellular systems. It is founded on the radio access method give by ETSI Alpha group with the features and specifications finalized in 1999.

The implementation of W-CDMA will cover very technical details. The complexity of the systems can be seen from various angles. These include the complexity of the receiver, the complexity of the overall system and the complexity of the single algorithm.

In W-CDMA, the interface allows users of 3G to instantly send and get various data rates. UMTS networks will need the support of all current 2G services and several new services and applications. You should consider if this will be the right technique for you.

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